|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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The Entrail-Expelling Curse (Incantation Unknown) is a spell. Its effects are unknown, but presumably it causes one's entrails to be expelled from the body, or more than likely (being invented by a healer) a curse used to expel blockages from entrails, aka intestines, in the event of constipation or obstruction by a foreign object. Essentially, it's a magical enema.
- Harry Potter and the Order of the Phoenix (First mentioned)